Telephone-receiver.



N0.847,842. PATBNTEDMAR.19,1907.

. L. STBINBERGER.

TELEPHONE RECEIVER. APpLoATronfrxLnD AUG. 4. 1904.

Afro/mns l UNITED STATES 'PATENT OFFICE.

LoUrssTEiNBnncnR, orNEw YORK, N. Y.

I Speicationo Letters Patent. Y

Patented Marchfie, 1907.

I ioseveral objects of :my-invention being, 5.15812',

'to provide the receiver lwith f a casingl of metal second, to provide'teleyhonereceivers f or similar deviceslin which t ema et and other parts-s'uch 'as binding-posts,"l inding-;

x post sockets, and the'suspending-.hookj-.are `embeddedinfan insulatin ,material which fo'ms a core that is receivefin an-outer'shell or case; third,` to provide aneicient; ls implc'a-,v

' in at r describe fourth, toV intensify theA sonndwaves reproduced by thereceiver.. 1

Reference is to be had to the accompanyv ing drawin forming a part of this specifica,

2 5 tion, in w ich similar characters' or refer# ence indicatecorre'sponding parts in all the figures.-

. Figure 1 is a Central section through areceiverof my invention. Fig. 2 is' a fragmentary section showing/a part of the'jacket 5 in elevation, and Fig. 3 is an end elevation slfuwing the receiver as viewed from the left A sgolid core of insulating material 4is disposed within' the casing 5 and has embedded therein a number of metallic parts.- -An annular collar 6 is threaded at 11 and mounted directly' upon the core 4, whichis also threaded. Binding-posts 7 8, together with an eye 9, are embedded directly within the solid core of insulating material 4, the eye 9 being provided with an anchorage 10 to enable it to hold to better advantage,.....The casing 5 at Athe rear end abuts against the eollar 6 and yat the opposite' end is provided with van annular portion 12, threaded externally and mutilated internally, as at 12"* in Figs. 1 and 2.

Screwed-upon this annular .portion is a cap' 1 3 preferably of insulating material, provided with facets 14 and With a bulged or out.-

wardly-projecting portion 15, substantially' frusto-conical, this portion being provided with a circular aperture 16, the said project-- ing portion- 15 in lthef'orm illustrated 'being' he member4,nf insulatingrmferialiaprc .Siate 4of New.

- materia bipolar vmagnet 18, liountedv liporitlleI poleieces 19 of the permanent magnetO. The

ing-posts r7,8 b wiresj2'1' these wires being -likewiseembeddc I A, v l

ing material forming the'fcore 4. -Y The dialusual' constructiom The cap 1 -3 is provided 23,. whichv may with advantage bei of; slightly 'smallerdiameer than'v the diaphragm 22,and

Ipreferably 'the' inner scigfaceoft e ca 13 heldp i f. dome-shaped?'-{Thedlaphragm is vided with ya concave fa'ce =17, lcol-ita'in'ng al )ipolar magnet lis` connecteditith-.th'e' bindj phragm shown at 22 and'inay' be 'of the npo-` sitionfbypifessure ofttho cap-13;'which binds f ift directlysa'gain'stthe enlarged end of the'ind solidly-:Within thev insulate v 'with 1annular cylindricaljhollow interior -Wiihtbjl table r slielffthe latter is engag'ed by one'of from rolling'jljwi'lhef "ortin 15 by projecting partl intothe'earo Isubscribefr When the conveyth'e sound into the earfand to more 'efectrvely exclude extranepus sounds from improves' its appearance, besides/littering as shown-in -`Figs. 1 and 2, for the purpose of reflecting the sound-waves, the insulating material provided with the concavi'ty thus The revision of a-sound-.chamber between the iaphragm land the cap or earpiece, it Will be observed, lsan'iniportant improve- 'ment removed 'without disturbing the bindingposts 7.8, While thebi olar magnet Vis ren: deredaccessible b mere y removing the diaphragm '22, the ermanent magnet 20 vand the poleepieces 19 are secured rigidly within the core of insulating material 4 and are therefore not remov ble.

It willbe seen that in the insulating-core there maybe embedded as many of the me; 'tallic parts as ma .-be desired. The casing 5is made of meta The cap xshould lpreferably be made of a suitable insulating mate- -rial The construction also admits of other` combinations. V "l phrag'gm.-- l')ei`1figfreel to i vibrate-:ain the .usual and reliable constructionofftelephone-ref. zo ceive possessingi certain advantages here, i "3;'itfwill 'be seen that c'eiverI is-.allcwed to're'st upon the- .the ear.V `The metallic casingmakes'thetelephonereceiver more-,durableand also acting to some extent as a sounding-bvox.-

telep one is 'in nsefs'erves tojmoregefectively I greater rotectionfor the mass of insulating Theconcavity 17.is made smooth,

IIO.

,constitute also a means for securing engage-1 molded into said metallic member and alsoA The interiorlymutilatedv portion 12` may shell or casing, as those skilled in the art will* readily understand that many variations may be employed without departing from the spirit or scope of my invention.

Having thus described, my invention, I claim as new and desire to secure by Letters 1. In a telephone-receiver', the combination of a metallic member provided with an enlarged end integral the1"e\vith, said enl-ff" largedend having mutilations disposed internallyv thereof and also being threaded externally, a member of insulating material prevent relative movement as between said metallicA member and said member of insulating material,' a cap. of insulating material threaded internally and fitted u on saidlvenlarged end, and ma netic mec anism sup. ported by said 'mem er of insulating mate- 'rial and a diaphragm disposed adjacent 'to said magnetic mechanism.

2. In a telephone-receiver, a metallic casling provided with an enlarged end. having mut ations disposed internally thereof, a membenof insulating material encircled by said casing and providedwith an enlarged end lla-ving portions extending into said 'mutilations, a dia hragm mounted lupon lsaid member of insu ating material, and magnetic mechanism supported in proximity'to said diaphragm by said member of insulating m'aterial.'l l

y ,In testimonywhereof IT have signed vmy naineto thisspecification'in the presence of two subscribing'witnessesi l. 'jLoUIs sTEINBE-RGER.

into the internal mutilations thereof so as to 

